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SAE-AISI H25 Steel vs. 7175 Aluminum

SAE-AISI H25 steel belongs to the iron alloys classification, while 7175 aluminum belongs to the aluminum alloys. There are 21 material properties with values for both materials. Properties with values for just one material (10, in this case) are not shown. Please note that the two materials have significantly dissimilar densities. This means that additional care is required when interpreting the data, because some material properties are based on units of mass, while others are based on units of area or volume.

For each property being compared, the top bar is SAE-AISI H25 steel and the bottom bar is 7175 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
70
Poisson's Ratio 0.29
0.32
Shear Modulus, GPa 79
26
Tensile Strength: Ultimate (UTS), MPa 710 to 1620
520 to 570

Thermal Properties

Latent Heat of Fusion, J/g 250
380
Melting Completion (Liquidus), °C 1750
640
Melting Onset (Solidus), °C 1700
480
Specific Heat Capacity, J/kg-K 420
870
Thermal Conductivity, W/m-K 26
140
Thermal Expansion, µm/m-K 12
23

Otherwise Unclassified Properties

Base Metal Price, % relative 38
10
Density, g/cm3 9.1
3.0
Embodied Carbon, kg CO2/kg material 6.2
8.2
Embodied Energy, MJ/kg 93
150
Embodied Water, L/kg 83
1130

Common Calculations

Stiffness to Weight: Axial, points 12
13
Stiffness to Weight: Bending, points 22
46
Strength to Weight: Axial, points 22 to 50
48 to 52
Strength to Weight: Bending, points 20 to 34
48 to 51
Thermal Diffusivity, mm2/s 6.7
53
Thermal Shock Resistance, points 22 to 49
23 to 25

Alloy Composition

Aluminum (Al), % 0
88 to 91.4
Carbon (C), % 0.22 to 0.32
0
Chromium (Cr), % 3.8 to 4.5
0.18 to 0.28
Copper (Cu), % 0 to 0.25
1.2 to 2.0
Iron (Fe), % 77.2 to 81.3
0 to 0.2
Magnesium (Mg), % 0
2.1 to 2.9
Manganese (Mn), % 0.15 to 0.4
0 to 0.1
Nickel (Ni), % 0 to 0.3
0
Phosphorus (P), % 0 to 0.030
0
Silicon (Si), % 0.15 to 0.4
0 to 0.15
Sulfur (S), % 0 to 0.030
0
Titanium (Ti), % 0
0 to 0.1
Tungsten (W), % 14 to 16
0
Vanadium (V), % 0.4 to 0.6
0
Zinc (Zn), % 0
5.1 to 6.1
Residuals, % 0
0 to 0.15